add note about EventHopper scoring
add note about EventHopper scoring

isi-nlp/tac-kbp-eal,isi-nlp/tac-kbp-eal,rgabbard-bbn/kbp-2014-event-arguments,rgabbard-bbn/kbp-2014-event-arguments,BBN-E/tac-kbp-eal,BBN-E/tac-kbp-eal